491589 has 36 divisors (see below), whose sum is σ = 893984. Its totient is φ = 264384.

The previous prime is 491581. The next prime is 491591. The reversal of 491589 is 985194.

It is not a de Polignac number, because 491589 - 2³ = 491581 is a prime.

Its product of digits (12960) is a multiple of the sum of its prime divisors (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 28909 + ... + 28925.

2⁴⁹¹⁵⁸⁹ is an apocalyptic number.

It is an amenable number.

491589 is a deficient number, since it is larger than the sum of its proper divisors (402395).

491589 is an equidigital number, since it uses as much as digits as its factorization.

491589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56 (or 27 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 491589 is about 701.1340813282. The cubic root of 491589 is about 78.9224791015.

The spelling of 491589 in words is "four hundred ninety-one thousand, five hundred eighty-nine".